MarkVD

Full information about any color (schemes, shades, conversion in rgb, hsl, etc.). Eyedropper, Color Picker and Gradient Generator.

Quick access to the color encyclopedia. Free color tool converting and providing full information about any color.

Free tool providing information about any Unicode character.

Free tools for performing various calculations with fractions.

Z-table lookup: Find the percentage of values below a given z-score in a standard normal distribution.

CSS Gradient Editor (Linear, Radial and Conic).